some opt

midend/llvm/value/IrBasicBlock.java

@@ -35,6 +35,27 @@ public class IrBasicBlock extends IrValue {
         instr.setBBlock(this);
     }
 
+    public void addInstr(IrInstr instr, int index) {
+        instrs.add(index, instr);
+        instr.setBBlock(this);
+    }
+
+    public void deleteInstr(IrInstr instr) {
+        instrs.remove(instr);
+        instr.setBBlock(null);
+        instr.clearUses();
+        instr.clearUsers();
+    }
+
+    public void clearAllInstrs() {
+        for (IrInstr instr : instrs) {
+            instr.setBBlock(null);
+            instr.clearUses();
+            instr.clearUsers();
+        }
+        instrs.clear();
+    }
+
     public IrFuncValue getFunc() {
         return func;
     }
@@ -87,6 +108,20 @@ public class IrBasicBlock extends IrValue {
         return instrs;
     }
 
+    public IrInstr getFirstInstr() {
+        if (instrs.isEmpty()) {
+            return null;
+        }
+        return instrs.get(0);
+    }
+
+    public IrInstr getLastInstr() {
+        if (instrs.isEmpty()) {
+            return null;
+        }
+        return instrs.get(instrs.size() - 1);
+    }
+
     public void addPred(IrBasicBlock bb) {
         this.preds.add(bb);
     }
@@ -119,6 +154,14 @@ public class IrBasicBlock extends IrValue {
         return this.directDomi;
     }
 
+    public HashSet<IrBasicBlock> getDirectDomies() {
+        return directDomies;
+    }
+
+    public HashSet<IrBasicBlock> getDomiFrontier() {
+        return domiFrontier;
+    }
+
     public void toMips() {
         new MipsLabel(getMipsLabel());
         for (IrInstr instr : instrs) {